Handle righthanded polygons in format, not source

src/ol/format/featureformat.js

@@ -24,6 +24,12 @@ ol.format.Feature = function() {
    * @type {ol.proj.Projection}
    */
   this.defaultDataProjection = null;
+
+  /**
+   * @protected
+   * @type {boolean}
+   */
+  this.rightHandedPolygons = false;
 };
 
 
@@ -53,6 +59,14 @@ ol.format.Feature.prototype.getReadOptions = function(source, opt_options) {
 };
 
 
+/**
+ * @return {boolean}
+ */
+ol.format.Feature.prototype.getRightHandedPolygons = function() {
+  return this.rightHandedPolygons;
+};
+
+
 /**
  * Sets the `defaultDataProjection` on the options, if no `dataProjection`
  * is set.